Electromagnetic switch



A. A. ADAMS AND F.r A. EMERY.

ELECTROMAGNETIC SWITCH.

APPLICATIONVHLED sEP.29,19l.

1,356,501. Y Patented oet. 19,1920.

' /"jg A Z/ 5 g C) Ha i?? /s Q) UNITED STATES .PATENT OFFICE.

ARTHUR A. ADAMS, OF BROOKLINE, AND FRANK A. EMERY, OF WELLESLEY HILLS,

MASSACHUSETTS, ASSIGNORS TO BOSTON SCALE & MACHINE COMPANY,

OF BOS- TON, MASSACHUSETTS, A CORPORATION OF MASSACHUSETTS.

ELECTROMAGNETIC SWITCH.

Application filed September 29, 1917.

To all whom t may concern Be it known that we, ARTHUR A. ADAMs and FRANK A. EMERY, citizens of the United States, residing at Brookline, in the county of Norfolk, and at Vellesley Hills, 1n the county of Middlesex, State of Massachuseits, respectively, have invented certain new and useful Improvements in Electromagnetic Switches, of which the following is a specification.

This invention relates to electro-magnetic circuit-controlling devices or switches, and has for one of its important objects to provide a device of such character which shall be simple in construction, reliably operative and inexpensive to manufacture.

Another object of the invention lies in the provision of improved means for avoiding pitted or burned contacts and imperfect en gaoement.

nother object of the invention lies in the provision of a circuit-controlling device of extremely compact form.

Other objects of the invention will be in part obvious and in part pointed out hereinafter.

The invention accordingly consists of the various features of construction, combination of elements and arrangements of parts which will be exemplified by the construction hereinafter set forth and the scope of the application of which will be indicated in the following claims.

In the accompanying drawings, wherein is shown one of various possible embodiments of the invention,-

Figure l is a plan view of an electro-magnetic circuit-controlling device embodying the invention.

Fig. 2 is a view in elevation of the same.

Referring now more particularly to the drawings, wherein similar reference characters refer to similar parts throughout the several views, there is indicated at l an electro-magnet,comprising spaced core elements 2 mounted on a supporting plate 3. Between the core elements there is arranged an armature shaft 4;, loosely journaled at one end in the supporting or magnet plate 3, and at its opposite end in a plate 5 which is in turn secured to the poles or core elements of the magnet. Fast on said armature shaft is a reciprocatory or rocking armature 6 adapted to be oscillated toward the poles of Specification of Letters Patent.

, tact Patented Oct. 19, 1920.

Serial No. 193,891.

the magnet when its windings 7 are energized and to be oscillated in the opposite direction by a spring 8 when said windings are denergized. The spring action is limited by a stop 10 depending from the plate 5. It will be noted that the upper and lower plates 5 and 3 provide frame elements which may be supplemented by horizontally disposed contact-supporting bars 1l, spaced apa-rt and apertured toreceive posts 12 extending between and secured to said plates 5 and 3, said bars 1l being held in their spaced relation by spacing sleeves or bushings 13.

A yoke arm 14 is formed on the armature 6, and in turn carries bridging means or elements comprising a carbon roller l5 rotativcly mounted on a shaft 16 secured to the yoke arm by a pin 1T and insulated therefrom by a suitably anged bushing 18. The carbon roller, such as described, presents an advantageous construction, since each time it engages its adjacent contacts or brushes, it does not rub past said contacts, but rotates freely into engagement therewith and at each succeeding operation, presents a different portion of its surface to said contacts, reducing the wear thereon and preventing sparking, burning, pitting, etc.

The shaft 16 projects beyond the yoke arm and receives a bridging contact 2() being herein shown in the form of a brass tube. Suitably mounted upon the frame above referred to are a plurality of consets,one set comprising the fixed contacts and 23, which extend beyond the bridging elements and are of resilient material with their ends curved and bent back to engage with the bridging element or brass tube 2l when the electro-magnet is denergized and the spring S has moved the armature to position against the stop 10. Another set of contacts comprises three fixed brushes 2li, 25 and 26, the first two of which extend beyond the third in order to be initially bridged, when the magnet is enen gized. The third brush 26 is arranged to be bridged upon subsequent or further continued movement of the armature. The contacts of this set are suitably resilient and preferably of brass or copper with split end portions to facilitate engagement with the carbon roller.

The core elements are recessed at 30 for a portion of their diameter to receive the armature upon energization of the windings, and the magnet or supporting plate 3 is provided with attaching points, whereby the complete structure may be secured Within a casing or upon a suitable standard. yifhe loose carbon roller l5 is found highly desirable, in View of the length of movement required between this bridging element and the 'contacts 24e and 25 in order for the bridging element to also include the shorter fixed brush or contact 2.6.

As many changes could be made in the above construction and as many apparently Widely different embodiments of the invention could be made Without departing 'from the scope thereof, it is intended that all matter set forth in the foregoing description or shown in the accompanying drawings shall be interpreted as illustratiif'e and not in a limiting' sense.

l. ln a circuit-controlling sivitc ring device, in combination a pair of cores, energizing windings on said cores, an oscillatory armature pivotally mounted between said cores, spring means for actuating lsaid armature in a direction opposite to the inn ylnence of said energizing windings, a plurality of contact-bridging elements carried by said armature including a carbon roller, and a plurality of sets oit lifted contacts, one set being bridged by one of said elements when the windings are deenergized, and another set being bridged by said carbon roller when the windings are energized.

2. A switch o the character described having in combination, a magnet; an armature for said magnet pivot-ally supported to oscillate upon an axis parallel with the axis ot the magnet so as to swing toward and from thepole piece of said magnet; a contact carried by said armature; tivo station arily supported circuit terminal spring contacts, one engaged by said armature Contact when said armature is swung in one direction and the other engaged by said armature contact When said armature is swung in an opposite direction, and means independent O said stationarily supported con rec'tion and the other engaged by said armature Contact when said armature is swung in an opposite direction, means independent ot said stationarily supported contacts for limiting the movements of said armature in both directions,l and a base plate from Which sa'd magnet, armature and stationary contacts are supported.

4i.. ln a switch, in combination, a magnet, a rocking armature therefor, Contact means comprising a loosely mounted roller carried -by said armature, iixed contacts one of 'which is adapted to be engaged by lsaid contact means as the armature' is rocked in one direction and another of which is adapted to be engaged as the armature is rocked in the opposite direction, and stops independent of said fixed 'contacts for limiting the rocking movement of said armature in either direction.

ln a switch, in combination, a pair oi' cores, energizing windings on said cores, an oscillatory armature pivotally mounted between said cores, spring means for actuating said armature in a direction opposite to the influence of said energizing `windings, movable contact means comprising a carbon roller carried by said armature, xed contacts arranged to be engaged by said movable contact means as the armature oscillates in opposite directions, and stops independent ot' said contacts for limiting the movement ot said armature in either direction.

ARTHUR A. ADAMS. FRANK A. EMERY. 

